Anti-glare film, display device, head-up display device and vehicle

Abstract

The invention relates to an anti-dazzle film, a display device, a head-up display device and a vehicle in the technical field of display. The anti-dazzle film is used for being arranged on the light emitting side of an image source. The anti-dazzle film comprises an anti-dazzle layer, and the anti-dazzle layer is located on the side, away from an image source, of the anti-dazzle film. The anti-dazzle layer comprises sawtooth parts arranged in an array mode, each sawtooth part is in a triangular prism shape, the cross section obtained by cutting each sawtooth part in the direction parallel to the array arrangement direction is in a triangular shape, each triangle comprises a bottom edge, a first side edge and a second side edge which are sequentially connected end to end, and the plane where the bottom edge is located is parallel to the plane where the light emitting side of the image source is located. According to the arrangement, the sawtooth part located on the outer side of the anti-dazzle film is used for reflecting the ambient light entering the sawtooth part at different angles, so that the amount of the ambient light reflected to the observation area is reduced or avoided, and the anti-dazzle purpose is achieved.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to an anti-glare film, a display device, a head-up display device and a vehicle. Background Art

[0002] The Head Up Display (HUD) device forms a virtual image in front of the imaging part by projecting image light emitted by an image source onto an imaging part (such as a vehicle's windshield or a rear-mounted imaging board or other structure), so that users can see the information without lowering their heads, thereby providing a better user experience.

[0003] In the related art, when ambient light incident on an image source in a HUD device is reflected on the surface of the image source and then enters the observation area of ​​the HUD device, the reflected light of the ambient light may interfere with the user, causing glare and affecting the user's viewing of the virtual image projected by the HUD device. Summary of the invention

[0004] In order to solve the above technical problems, the present disclosure provides an anti-glare film, a display device, a head-up display device and a vehicle.

[0005] In a first aspect, the present disclosure provides an anti-glare film, wherein the anti-glare film is used to be arranged on the light-emitting side of an image source;

[0006] The anti-glare film comprises an anti-glare layer, and the anti-glare layer is located on a side of the anti-glare film away from the image source;

[0007] The anti-glare layer includes sawtooth portions arranged in an array, a single sawtooth portion is in the shape of a triangular prism, a cross-section of a single sawtooth portion cut along a direction parallel to the array arrangement direction is triangular, the triangle includes a base, a first side, and a second side connected end to end in sequence, and the plane where the base is located is parallel to the plane where the light emitting side of the image source is located.

[0008] Optionally, the image source comprises pixel units arranged in an array;

[0009] The width of a single sawtooth portion is greater than the width of a single pixel unit; the width of a single sawtooth portion is equal to the length of the bottom edge or the distance between the top angles of two adjacent sawtooth portions, and the top angle is the angle between the first side edge and the second side edge.

[0010] Optionally, a ratio of a width of a single sawtooth portion to a width of a single pixel unit is greater than or equal to 2.

[0011] Optionally, the vertex angle is an arc angle, and the inner fillet radius corresponding to the arc angle is less than or equal to 1 μm.

[0012] Optionally, an absolute value of a difference between a refractive index of the anti-glare film and a refractive index of the image source is less than or equal to a preset difference threshold.

[0013] Optionally, the refractive index of the anti-glare film is equal to the refractive index of the image source.

[0014] Optionally, the anti-glare film further comprises: a substrate layer, the substrate layer being located on a side of the anti-glare film close to the image source;

[0015] The side of the substrate layer facing away from the image source is connected to the plane where the bottom edge of the sawtooth portion of the array arrangement is located, and the side of the substrate layer facing the image source is in contact with the image source;

[0016] The thickness of the substrate layer is 50 μm to 1 mm;

[0017] The length of the second side of a single sawtooth portion is greater than the length of the first side.

[0018] In a second aspect, the present disclosure further provides a display device, comprising: any one of the above-mentioned anti-glare films and an image source;

[0019] The anti-glare film is arranged on the light-emitting side of the image source.

[0020] Optionally, the display device further comprises: an adhesive layer, through which the anti-glare film is attached to the image source;

[0021] An absolute value of a difference between a refractive index of the adhesive layer and a refractive index of the image source is less than or equal to a preset difference threshold.

[0022] In a third aspect, the present disclosure further provides a head-up display device, comprising: any one of the above display devices and a reflective imaging unit;

[0023] The reflective imaging part is used to reflect the image light emitted by the image source and after passing through the anti-glare film into the observation area.

[0024] Optionally, the second base angles of each sawtooth portion in the anti-glare film are the same, or the second base angles of at least some of the sawtooth portions in the anti-glare film are different;

[0025] Wherein, the second bottom angles of all the sawtooth portions in the anti-glare film satisfy: ∠C>(γ2+α2-180°)÷2-θ';

[0026] Among them, ∠C represents the second base angle, which is the angle between the second side and the base; γ2 represents the maximum angle between the virtual image formed by the reflective imaging part in the observation area and the projection of the anti-glare film on the preset plane; α2 represents the maximum angle between ambient light and the preset plane; θ' represents the angle between the plane where the light-emitting side of the image source is located and the preset plane.

[0027] In a fourth aspect, the present disclosure further provides a vehicle, comprising: any one of the above-mentioned head-up display devices;

[0028] The plane where the second side edge is located faces the incident direction of the ambient light.

[0029] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0030] The present disclosure provides an anti-glare film, a display device, a head-up display device and a vehicle, wherein the anti-glare film is used to be arranged on the light-emitting side of an image source; the anti-glare film includes an anti-glare layer, and the anti-glare layer is located on the side of the anti-glare film away from the image source; the anti-glare layer includes a sawtooth portion arranged in an array, and the shape of a single sawtooth portion is a triangular prism, and the cross-section obtained by cutting a single sawtooth portion along a direction parallel to the array arrangement direction is a triangle, and the triangle includes a bottom edge, a first side edge and a second side edge connected in sequence from head to tail, and the plane where the bottom edge is located is parallel to the plane where the light-emitting side of the image source is located. In this arrangement, the sawtooth portion located on the outer side of the anti-glare film is used to reflect the ambient light incident on the sawtooth portion at different angles, so as to reduce or avoid the ambient light reflected to the observation area, thereby achieving the purpose of anti-glare. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0033] Figure 1 A schematic diagram of the structure of an anti-optical rotation film provided in an embodiment of the present disclosure;

[0034] Figure 2 A schematic diagram of the structure of a display device provided in an embodiment of the present disclosure;

[0035] Figure 3 A schematic diagram of a partially enlarged structure of an anti-glare film provided in an embodiment of the present disclosure;

[0036] Figure 4 A schematic diagram of the principle of generating moiré patterns provided in an embodiment of the present disclosure;

[0037] Figure 5 A schematic diagram of the structure of another display device provided by an embodiment of the present disclosure;

[0038] Figure 6 A schematic diagram of the structure of a head-up display device provided in an embodiment of the present disclosure;

[0039] Figure 7 A schematic diagram of the structure of another head-up display device provided in an embodiment of the present disclosure;

[0040] Figure 8 A schematic diagram of the structure of another head-up display device provided in an embodiment of the present disclosure;

[0041] Fig. 9 A schematic diagram of the structure of a vehicle provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0042] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0043] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0044] In order to solve the technical problems raised in the background technology section, the embodiments of the present disclosure provide an anti-glare film, a display device, a head-up display device and a vehicle. The anti-glare film is used to be arranged on the light-emitting side of an image source; the anti-glare film includes an anti-glare layer, and the anti-glare layer is located on the side of the anti-glare film away from the image source; the anti-glare layer includes a sawtooth portion arranged in an array, and the shape of a single sawtooth portion is a triangular prism. The cross-section obtained by cutting a single sawtooth portion along a direction parallel to the array arrangement direction is a triangle, and the triangle includes a bottom edge, a first side edge and a second side edge connected in sequence from head to tail, and the plane where the bottom edge is located is parallel to the plane where the light-emitting side of the image source is located. In this arrangement, the sawtooth portion located on the outer side of the anti-glare film is used to reflect the ambient light incident on the sawtooth portion at different angles, so as to reduce or avoid the ambient light reflected to the observation area, thereby achieving the purpose of anti-glare.

[0045] The anti-glare film, display device, head-up display device and vehicle provided in the embodiments of the present disclosure are exemplarily described below in conjunction with the accompanying drawings.

[0046] Figure 1A schematic diagram of the structure of an anti-optical rotation film provided in an embodiment of the present disclosure, Figure 2 This is a schematic diagram of the structure of a display device provided by an embodiment of the present disclosure. Figure 1 and Figure 2 The anti-glare film 1 is used to be arranged on the light-emitting side of the image source 2; the anti-glare film 1 includes an anti-glare layer, which is located on the side of the anti-glare film 1 away from the image source 2; the anti-glare layer includes serrations 11 arranged in an array, and the shape of a single serration 11 is a triangular prism. The cross-section of the single serration 11 cut along a direction parallel to the array arrangement direction X is a triangle, and the triangle includes a bottom edge 111, a first side edge 112, and a second side edge 113 connected in sequence from end to end, and the plane where the bottom edge 111 is located is parallel to the plane where the light-emitting side of the image source 2 is located.

[0047] The anti-glare film 1 is colorless and transparent, and will not change the color of the image light emitted by the image source 2, thereby avoiding color difference in the virtual image presented by the HUD. The material of the anti-glare film 1 is not limited in this embodiment, and all materials known to those skilled in the art, such as optical adhesive, can be used.

[0048] The anti-glare film 1 is located on the light-emitting side of the image source 2, and the anti-glare film 1 is in contact with the plane where the light-emitting side of the image source 2 is located, and the sawtooth portion 11 is located on the side of the anti-glare film 1 away from the image source 2, that is, the sawtooth portion 11 faces the external environment, and is used to reflect the ambient light incident on the anti-glare film. The anti-glare film 1 with the sawtooth portion 11 can be applied to image sources 2 of types such as liquid crystal display (LCD), light-emitting diode (LED), organic light-emitting display (OLED), and micro-light-emitting display (micro-LED), etc., without limitation here.

[0049] A single sawtooth portion 11 is in the shape of a triangular prism, including three rectangular sides and two triangular bottoms, and the three rectangular sides are connected end to end in sequence; the sawtooth portion 11 is cut along a direction parallel to the array arrangement direction X, that is, it is cut parallel to the two triangular bottoms, and the cross-section of the sawtooth portion 11 obtained is a triangle, and the triangle includes a base 111, a first side 112 and a second side 113 connected end to end in sequence, and the base 111, the first side 112 and the second side 113 respectively correspond to the three rectangular sides of the triangular prism; wherein, the rectangular side corresponding to the base 111 is parallel to the plane where the light-emitting side of the image source 2 is located, and it is closer to the light-emitting side of the image source 2; the rectangular side corresponding to the first side 112 and the second side 113 has an angle with the plane where the base 111 is located, that is, the first base angle ∠A and the second base angle ∠C.

[0050] For example, Figure 1As shown in Figure 2, the cross section of a single sawtooth portion 11 is a triangle, which includes a base 111 (i.e. AC), a first side 112 (i.e. AB) and a second side 113 (i.e. BC). The base 111, the first side 112 and the second side 113 correspond to the three rectangular sides of the triangular prism respectively. The rectangular side corresponding to the base 111 is parallel to the plane where the light-emitting side of the image source 2 is located, and the planes where the first side 112 and the second side 113 are located are two inclined surfaces. In this arrangement, the external ambient light is incident on the plane where the second side 113 of the sawtooth portion 11 is located, and will not fall into the observation area after being reflected by the plane where the second side 113 is located, so as to reduce or avoid the amount of ambient light reflected to the observation area, thereby achieving the purpose of anti-glare.

[0051] The anti-glare film 1 provided in the embodiment of the present disclosure is used to be arranged on the light-emitting side of the image source 2. The anti-glare film 1 includes an anti-glare layer, which is located on the side of the anti-glare film 1 away from the image source 2; the anti-glare layer includes serrations 11 arranged in an array, and the shape of a single serration 11 is a triangular prism. The cross section obtained by cutting a single serration 11 along a direction parallel to the array arrangement direction X is a triangle, and the triangle includes a bottom edge 111, a first side edge 112, and a second side edge 113 connected in sequence from head to tail, and the plane where the bottom edge 111 is located is parallel to the plane where the light-emitting side of the image source 2 is located. In this arrangement, the serrations 11 located on the outside of the anti-glare film 1 are used to reflect the ambient light incident on the serrations 11 at different angles, so as to reduce or avoid the amount of ambient light reflected to the observation area, thereby achieving the purpose of anti-glare.

[0052] In some embodiments, Figure 1 and 2 As shown, the angle of the first base angle ∠A is [70°, 90°]; the first base angle ∠A is the included angle between the first side 112 and the bottom 111.

[0053] The processing technology of the anti-glare film 1 is as follows: optical glue is coated on the surface of the sawtooth mold, and the optical glue is cured by ultraviolet light to obtain an anti-glare film with a sawtooth microstructure (i.e., the sawtooth portion 11), and the anti-glare film can be removed from the mold and applied to the image source. The first bottom angle ∠A is set to a right angle or an acute angle for easy demoulding.

[0054] Preferably, the first base angle ∠A is 85°.

[0055] In some embodiments, Figure 1 and Figure 3 As shown, the image source includes pixel units arranged in an array; the width Pitch of a single sawtooth portion 11 is greater than the width of a single pixel unit; the width Pitch of a single sawtooth portion 11 is equal to the length of the bottom edge 111 or the distance between the top angles ∠B of two adjacent sawtooth portions, and the top angle ∠B is the angle between the first side 112 and the second side 113.

[0056] The width Pitch of a single sawtooth portion 11 may be equal to the length of the bottom edge 111 , or may be equal to the distance between the top angles ∠B of two adjacent sawtooth portions.

[0057] After the image source 2 is attached to the anti-glare film 1, the arrayed sawtooth portions 11 have a periodic sawtooth microstructure, which can act as a grating. Light incident on the sawtooth portions will be diffracted, and the smaller the width Pitch of a single sawtooth portion 11, the more obvious the diffraction. Therefore, the width Pitch of a single sawtooth portion 11 is greater than the width of a single pixel unit, which is conducive to reducing the glare caused by diffraction.

[0058] In some embodiments, the width of a single sawtooth is greater than 100 μm; for example, the width of a single sawtooth is greater than 200 μm.

[0059] In some embodiments, a ratio of a width of a single sawtooth portion to a width of a single pixel unit is greater than or equal to 2.

[0060] Figure 4 The schematic diagram of the principle of generating moiré patterns provided by the embodiment of the present disclosure. Figure 4 As shown in the figure, when two sets of periodic microstructures with different spatial frequencies are superimposed together, moiré patterns will be generated; the calculation formula for the moiré pattern width is as follows:

[0061]

[0062] Wherein, W represents the width of the moiré pattern, P1 represents the width of the first group of periodic microstructures, P2 represents the width of the second group of periodic microstructures, and θ represents the angle between the two groups of periodic microstructures. When θ is equal to 0°, the width of the moiré pattern is the largest. Increasing θ can reduce the width of the moiré pattern.

[0063] The pixel units of the image source are arranged in an array, which can also be regarded as a periodic microstructure. After the image source is attached to the anti-glare film, the spatial frequency of the pixel units arranged in the array is different from that of the periodic microstructure of the anti-glare film, which causes the image light emitted by the image source to pass through the anti-glare film and finally form a virtual image through the front windshield of the vehicle. Moiré patterns appear in the virtual image, which reduces the picture quality of the virtual image and affects the user's visual effect.

[0064] Assuming that the width of a single pixel unit is P1=1 (i.e. equivalent to the size of a pixel), to ensure the moiré width W≤P1, when θ is small, P2≤0.5 is required, that is, the width of a single sawtooth portion is less than or equal to half the width of a single pixel unit, which will cause obvious diffraction and affect the user's visual effect; if the condition of the moiré width is relaxed to W≤2P1, when θ is small, P2≥2 is required, that is, the width of a single sawtooth portion is greater than or equal to twice the width of a single pixel unit; with this setting, both the reduction of moiré and the prevention of glare caused by diffraction can be achieved, and no obvious moiré will be generated and there will be no glare problem caused by diffraction.

[0065] In some embodiments, each pixel unit may include three sub-pixel units: R, G, and B.

[0066] Exemplarily, the width of a single sawtooth portion is equal to twice the width of a single pixel unit. Specifically, if the width of a single pixel unit is 50 μm, the width of a single sawtooth portion is 100 μm; if the width of a single pixel unit is 109 μm, the width of a single sawtooth portion is 218 μm; if the width of a single pixel unit is 200 μm, the width of a single sawtooth portion is 400 μm.

[0067] In some embodiments, Figure 3 As shown, the vertex angle ∠B is an arc angle, and the inner fillet radius R1 corresponding to the arc angle is less than or equal to 1 μm.

[0068] Due to the limitation of the processing technology, the vertex angle ∠B of the sawtooth portion 11 will have an arc angle (or called inner R angle), and the ambient light will be reflected on this arc angle to form astigmatism, thereby causing glare. In this way, the inner fillet radius R1 corresponding to the arc angle is less than or equal to 1μm, that is, the size of the arc angle is strictly controlled, so that the vertex angle ∠B is very sharp, effectively reducing the astigmatism reflected by the vertex angle ∠B.

[0069] It should be noted that the embodiment of the present disclosure only exemplarily shows the value range of the inner fillet radius R1, but does not constitute a limitation on the anti-glare film provided by the embodiment of the present disclosure. In other embodiments, the inner fillet radius R1 can also be set in other ranges, such as R1≤2μm, or R1≤0.5μm, or R1≤0.1μm, which is not limited here.

[0070] In some embodiments, an absolute value of a difference between a refractive index of the anti-glare film and a refractive index of the image source is less than or equal to a preset difference threshold.

[0071] When the difference between the refractive index of the anti-glare film and the refractive index of the image source is greater than a preset difference threshold, the light incident on the anti-glare film will be reflected at the interface between the anti-glare film and the image source, and the reflected light may also reach the observation area, which will also cause glare. Therefore, the absolute value of the difference between the refractive index of the anti-glare film and the refractive index of the image source is set to be less than or equal to the preset difference threshold, that is, the refractive index of the anti-glare film is close to the refractive index of the image source, which reduces the amount of light reflected at the interface, thereby achieving anti-glare.

[0072] The smaller the value of the preset difference threshold is, the closer the refractive index of the anti-glare film is to that of the image source, the closer the propagation speeds of light in the two media are, and the less light is reflected at the interface between the anti-glare film and the image source, which is conducive to achieving anti-glare. For example, the preset difference threshold can be 0.02, 0.01, 0.005 or 0.001, etc.

[0073] For example, taking the image source as an LCD liquid crystal display, the anti-glare film is attached to the liquid crystal screen of the liquid crystal display. The refractive index of the liquid crystal screen varies according to the material used, for example, between 1.470 and 1.700. According to the refractive index of the liquid crystal screen and the preset difference threshold, an anti-glare film with a refractive index that meets the requirements can be selected. For example, an anti-glare film with a refractive index of 1.49, 1.61 or 1.67 is selected.

[0074] In some embodiments, the refractive index of the anti-glare film is equal to the refractive index of the image source.

[0075] Among them, the refractive index of the anti-glare film is equal to the refractive index of the image source, the propagation speed of light in these two media is equal, and the light incident on the anti-glare film will not be reflected at the interface between the anti-glare film and the image source, thereby avoiding glare caused by light reflection at the interface.

[0076] For example, taking the image source as an LCD liquid crystal display, the anti-glare film is attached to the liquid crystal screen of the liquid crystal display, and the refractive index of the anti-glare film is equal to the refractive index of the image source (which can be equivalent to the refractive index of the liquid crystal screen); or, the liquid crystal screen includes a polarizer, that is, the anti-glare film is attached to the polarizer in the liquid crystal screen, then the refractive index of the anti-glare film is equal to the refractive index of the polarizer.

[0077] In some embodiments, Figure 1-2 and Figure 3As shown, the anti-glare film 1 also includes: a substrate layer 12, which is located on the side of the anti-glare film 1 close to the image source 2; the side of the substrate layer 12 facing away from the image source 2 is connected to the plane where the bottom edge 111 of the array-arranged serrations 11 is located, and the side of the substrate layer 12 facing the image source 2 is in contact with the image source 2; the thickness H of the substrate layer 12 is 50μm to 1mm, for example, 100μm, 200μm, or 500μm; and / or the length of the second side 113 of a single serration 11 is greater than the length of the first side 112.

[0078] The substrate layer 12 is located on the side of the anti-glare film 1 close to the image source 2, and includes a first surface and a second surface; the first surface is located on the side away from the image source 2, and is connected to the plane where the bottom edge 111 of the array-arranged sawtooth portion 11 is located; the second surface is located on the side facing the image source 2, and is in contact with the image source 2. The color of the substrate layer 12 is colorless and transparent, and will not change the color of the image light emitted by the image source 2, thereby avoiding color difference in the virtual image presented by the HUD. This embodiment does not limit the material of the substrate layer 12, and optical glue known to those skilled in the art, or all polymer materials, such as polycarbonate (PC) can be used.

[0079] The thickness H of the substrate layer 12 is 50 μm to 1 mm, which ensures that the anti-glare film has a certain strength and does not affect the transmittance of the image light. Preferably, the thickness H of the substrate layer 12 is 100 μm to 300 μm.

[0080] Among them, the length of the second side 113 is greater than that of the first side 112, and accordingly, the first base angle ∠A>∠C, and the vertex angle ∠B of the triangle is biased toward one side of the first side 112, that is, the area of ​​the plane where the second side 113 is located is greater than the area of ​​the plane where the first side 112 is located, and the plane where the second side 113 is located is an inclined plane, which faces the incident direction of the ambient light; with such a configuration, the ambient light incident on the anti-glare film 1 is projected onto the plane where the second side 113 is located, and the reflected light can be controlled in an area outside the observation area, thereby achieving anti-glare. For example, the observation area is located on a side away from the plane where the second side 113 is located, that is, the plane where the first side 112 is located faces the observation area, and most of the ambient light is incident on the plane where the second side 113 is located. The reflected light of the ambient light after being reflected by the plane where the second side 113 is located is controlled in an area closer to the plane where the second side 113 is located, that is, an area away from the observation area. The reflected light of the ambient light will not enter the observation area, which effectively reduces the amount of ambient light reflected to the observation area, thereby preventing the reflected light of the ambient light from interfering with the user's viewing of the virtual image, thereby achieving the purpose of anti-glare.

[0081] Based on the above implementation, the present disclosure also provides a display device. Figure 2As shown, the display device includes: any one of the above-mentioned anti-glare films 1 and an image source 2; the anti-glare film 1 is arranged on the light-emitting side of the image source 2; and has corresponding beneficial effects, which will not be repeated here to avoid repeated description.

[0082] For example, Figure 5 FIG. 1 is a schematic diagram of the structure of another display device provided by an embodiment of the present disclosure. Figure 5 The display device includes an anti-glare film 1 and an image source. The anti-glare film 1 is arranged on the light-emitting side of the image source. The image source includes a light source 21 and a display screen 23 (such as a liquid crystal screen). The anti-glare film 1 is attached to the side of the display screen 23 away from the light source 21. The side of the anti-glare film 1 away from the display screen 23 is provided with a sawtooth portion. The sawtooth portion is a plurality of sawtooth microstructures arranged in an array, which can reflect ambient light to an area away from the observation area, thereby achieving anti-glare. Optionally, the image source 2 also includes a light control device 22. The light control device 22 and the light source 21 are combined as a backlight source of the image source, so that the light source 21 can provide backlight for the display screen more evenly.

[0083] It should be noted that the anti-glare film 1 is attached to the outer surface of the component located at the outermost layer on the light-emitting side of the image source. For example, if the outermost layer on the light-emitting side of the image source is the display screen 23, the anti-glare film 1 is attached to the outer surface of the display screen 23, for example, the anti-glare film 1 is attached to the outer surface of the polarizer in the display screen 23.

[0084] In other embodiments, the image source may further include other components known to those skilled in the art, such as a diffusion element or a polarizer, which is not limited here.

[0085] In some embodiments, the display device further includes: an adhesive layer, through which the anti-glare film is attached to the image source; and an absolute value of a difference between a refractive index of the adhesive layer and a refractive index of the image source is less than or equal to a preset difference threshold.

[0086] The adhesive layer is located between the anti-glare film and the light-emitting side of the image source. The adhesive layer is made of colorless and transparent optical adhesive and will not change the color of the image light emitted by the image source.

[0087] The absolute value of the difference between the refractive index of the adhesive layer and the refractive index of the image source is less than or equal to a preset difference threshold, that is, the refractive index of the adhesive layer is close to the refractive index of the image source, which reduces the amount of light reflected at the interface, thereby achieving anti-glare. The preset difference threshold is 0.001 to 0.05, such as 0.02, 0.01, 0.005 or 0.001.

[0088] Preferably, the refractive index of the adhesive layer is equal to that of the image source, the propagation speed of light in these two media is equal, and light will not be reflected at the interface between the adhesive layer and the image source, thereby avoiding glare caused by light reflection at the interface.

[0089] Further preferably, the refractive indexes of the anti-glare film, the adhesive layer and the image source are equal. In this way, light incident on the anti-glare film will not be reflected at the interface between the anti-glare film and the adhesive layer and at the interface between the adhesive layer and the image source, thereby avoiding glare caused by light reflection at the interface.

[0090] Based on the above implementation, the present disclosure also provides a head-up display device. Figure 6-Figure 9 The head-up display device includes: any one of the above-mentioned display devices and a reflective imaging unit 3; the reflective imaging unit 3 is used to reflect the image light emitted by the image source 2 after passing through the anti-glare film 1 into the observation area 4.

[0091] The reflective imaging part 3 may be the front windshield of the vehicle. The image light emitted by the image source 2 passes through the anti-glare film 1 and is incident on the reflective imaging part 3. The reflective imaging part 3 reflects the image light to the observation area 4, so that the image light is reflected in front of the reflective imaging part 3 (in the observation area 4). Figure 6 When the user's eyes are located in the observation area 4, the user can see the virtual image formed in front of the reflection imaging part 3, for example, the virtual image located in front of the front windshield. By providing an anti-glare film 1 with a serrated portion on the outer surface of the light-emitting side of the image source 2, the plane where the second side edge is located faces the incident direction of the ambient light incident on the image source from the outside of the vehicle, and the ambient light incident on the serrated portion is reflected at different angles to reduce or avoid the amount of ambient light reflected to the observation area, thereby achieving the purpose of anti-glare.

[0092] The observation area is the eye box area of ​​the head-up display device, and the user can only see the virtual image when the user's eyes are located in the eye box area. By attaching an anti-glare film to the light-emitting side of the image source, the ambient light incident on the anti-glare film (i.e., the ambient light incident toward the image source) is reflected by the jagged microstructure of the anti-glare film and falls into the area outside the observation area, thereby not interfering with the user's viewing of the virtual image and achieving an anti-glare effect.

[0093] In some embodiments, Figure 6-7 As shown, the second base angles ∠C of all the sawtooth portions in the anti-glare film are the same, or the second base angles ∠C of at least some of the sawtooth portions in the anti-glare film are different; the second base angles ∠C of all the sawtooth portions in the anti-glare film satisfy:

[0094] ∠C>(γ2+α2-180°)÷2;

[0095] Among them, ∠C represents the second base angle, which is the angle between the second side 113 and the base; γ2 represents the maximum angle between the virtual image 4' formed by the reflective imaging part 3 in the observation area 4 and the projection of the anti-glare film on the preset plane Y; α2 represents the maximum angle between the ambient light and the preset plane Y.

[0096] Reference Figure 6 , the plane where the light-emitting side of the image source 2 is located is parallel to the preset plane Y, the bottom edge of the serrated portion in the anti-glare film 1 is parallel to the preset plane Y, the angle between the second side edge 113 of the serrated portion and the preset plane Y is equal to the second bottom angle ∠C, the angle between the reflective imaging portion 3 and the preset plane Y is β, the minimum angle between the ambient light and the preset plane Y is α1, and the maximum angle is α2; when the ambient light is reflected by the anti-glare film 1, the angle range between the reflected light and the preset plane Y is [180°-α2+2∠C, 180°-α1+2∠C].

[0097] Reference Figure 7 In order to achieve the purpose of anti-glare, it is necessary to ensure that the reflected ambient light cannot enter the observation area 4, nor can it enter the observation area 4 after being reflected by the reflective imaging part 3. Assuming that the maximum angle between the observation area 4 and the projection of the anti-glare film on the preset plane Y is γ1, the maximum angle between the virtual image 4' formed by the observation area 4 through the reflective imaging part 3 (i.e., the mirror image of the observation area 4 relative to the reflective imaging part 3) and the projection of the anti-glare film on the preset plane Y is γ2; γ2 must be greater than γ1. It is necessary to ensure that 180°-α2+2∠C>γ2, therefore, ∠C>(γ2+α2-180°)÷2. For example, α2 is 170°, γ2 is about 78°, then ∠C>(78°+170°-180°)÷2=34°.

[0098] It should be noted that the limiting condition for the second bottom angle ∠C in this embodiment is applicable to the case where the image source 2 (or display screen 23) is placed horizontally, that is, the plane where the light emitting side is located is parallel to the preset plane Y. For the case where the image source 2 (or display screen 23) is not placed horizontally, the angle between the plane where the light emitting side is located and the preset plane Y also needs to be considered. For details, please see the explanation of the following embodiment.

[0099] In this embodiment, the second bottom angles ∠C of all the sawtooth portions of the anti-glare film may be the same or different, but all the second bottom angles ∠C must meet the above angle requirements.

[0100] In some embodiments, Figure 8 As shown, the second bottom angle ∠C of all the sawtooth portions in the anti-glare film satisfies: ∠C>(γ2+α2-180°)÷2-θ'; wherein θ' represents the angle between the plane where the light-emitting side of the image source is located and the preset plane Y.

[0101] Wherein, θ' is an angle less than 90°, θ' is positive when it is above the preset plane Y, and θ' is positive when it is below the preset plane Y (such as Figure 8 is a negative value.

[0102] Reference Figure 8 , the plane where the light-emitting side of the image source 2 is located is below the preset plane Y, and the angle between the plane where the light-emitting side is located and the preset plane Y is θ', at this time θ'<0°; the angle between the bottom edge of the serrated portion and the preset plane Y is also θ', and since the preset plane Y is a reference plane, it will not change. Therefore, the angle between the second side edge 113 and the preset plane Y, the minimum angle α1 and the maximum angle α2 between the ambient light and the preset plane Y, the maximum angle γ1 between the observation area 4 and the projection of the anti-glare film on the preset plane Y, and the maximum angle γ2 between the virtual image 4' and the projection of the anti-glare film on the preset plane Y will not change; the second bottom angle ∠C is equal to the angle between the second side edge 113 and the preset plane Y minus θ'. Combined with the previous embodiment, the angle between the second side edge 113 and the preset plane Y needs to satisfy greater than (γ2+α2-180°)÷2, then the angle of the second bottom angle satisfies: ∠C>(γ2+α2-180°)÷2-θ'.

[0103] It should be noted that Figure 6-Figure 8 The preset plane Y is only exemplarily shown as a horizontal plane, but does not constitute a limitation on the display device provided in the embodiment of the present disclosure. In other embodiments, the preset plane Y can be set as a reference plane of any angle, which is not limited here.

[0104] Among them, γ2 is determined by the angle β between the reflective imaging part 3 and the preset plane Y, the position of the observation area relative to the reflective imaging part 3, and the position of the anti-glare film relative to the reflective imaging part 3, which can be specifically measured by an optical measuring instrument.

[0105] Based on the above implementation, the embodiment of the present disclosure further provides a vehicle, including: any of the above-mentioned head-up display devices, wherein the plane where the second side is located faces the incident direction of the ambient light, and has corresponding beneficial effects, which will not be repeated here to avoid repeated description.

[0106] Among them, the embodiments of the present disclosure do not limit the type of vehicle, including but not limited to cars, trains, motor vehicles, subways, and maglev trains.

[0107] For example, Fig. 9 FIG. 1 is a schematic diagram of a vehicle structure provided by an embodiment of the present disclosure. Fig. 9The vehicle includes a head-up display device, which includes a display device and a reflective imaging unit 3. The reflective imaging unit 3 is a front windshield 31. The display device includes an image source 2 and an anti-glare film 1 disposed on the light-emitting side of the image source 2. The outer surface of the anti-glare film 1 is provided with an array of serrated microstructures. The image light emitted by the image source 2 passes through the anti-glare film 1 and is incident on the front windshield 31. The front windshield 31 reflects the image light into the observation area to form a virtual image. In this way, the user can see the virtual image when his eyes are in the observation area. Combined with Figure 1 The sawtooth microstructure arranged in an array is the sawtooth portion 11, and the cross-section of the sawtooth portion 11 is a triangle. The triangle includes a base 111 (i.e. AC), a first side 112 (i.e. AB) and a second side 113 (i.e. BC) connected in sequence from beginning to end. The plane where the base 111 is located is parallel to the plane where the light-emitting side of the image source 2 is located, and the length of the second side 113 is greater than the length of the first side 112. Correspondingly, the area of ​​the plane where the second side 113 is located is greater than the area of ​​the plane where the first side 112 is located, and the vertex angle ∠B of the triangle is biased toward one side of the first side 112; the plane where the second side 113 is located is facing the front direction of the vehicle, and the plane where the first side 112 is located is facing the rear direction of the vehicle. In this way, the ambient light incident through the front windshield 31 is projected on the plane where the second side 113 is located, and the ambient light is reflected to an area outside the observation area, thereby achieving anti-glare.

[0108] It should be noted that Fig. 9 The reflective imaging unit 3 is only exemplarily shown as a front windshield 31, but it does not constitute a limitation on the vehicle provided in the embodiment of the present disclosure. In other embodiments, the reflective imaging unit 3 can also be set as other components with reflective functions known to those skilled in the art, such as a rear-mounted reflector, which is not limited here.

[0109] In other implementations, the head-up display device provided in the above embodiments may also be applied to other transportation vehicles, such as ships, airplanes, or spacecraft, which is not limited here.

[0110] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0111] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An anti-glare film, characterized in that: The anti-glare film is used to be arranged on the light-emitting side of the image source; The anti-glare film comprises an anti-glare layer, and the anti-glare layer is located on a side of the anti-glare film away from the image source; The anti-glare layer includes sawtooth portions arranged in an array, a single sawtooth portion is in the shape of a triangular prism, a cross-section of a single sawtooth portion cut along a direction parallel to the array arrangement direction is triangular, the triangle includes a base, a first side, and a second side connected end to end in sequence, and the plane where the base is located is parallel to the plane where the light emitting side of the image source is located.

2. The anti-glare film according to claim 1, characterized in that: The image source includes pixel units arranged in an array; The width of a single sawtooth portion is greater than the width of a single pixel unit; the width of a single sawtooth portion is equal to the length of the bottom edge or the distance between the top angles of two adjacent sawtooth portions, and the top angle is the angle between the first side edge and the second side edge.

3. The anti-glare film according to claim 2, characterized in that: The ratio of the width of a single sawtooth portion to the width of a single pixel unit is greater than or equal to 2.

4. The anti-glare film according to claim 2, characterized in that: The top angle is an arc angle, and the inner fillet radius corresponding to the arc angle is less than or equal to 1 μm.

5. The anti-glare film according to claim 1, characterized in that: An absolute value of a difference between a refractive index of the anti-glare film and a refractive index of the image source is less than or equal to a preset difference threshold.

6. The anti-glare film according to claim 5, characterized in that: The refractive index of the anti-glare film is equal to the refractive index of the image source.

7. The anti-glare film according to claim 1, characterized in that: The angle of the first bottom angle is [70°, 90°], and the first bottom angle is the included angle between the first side and the bottom edge.

8. The anti-glare film according to any one of claims 1 to 7, characterized in that: Also includes: A substrate layer, the substrate layer is located on a side of the anti-glare film close to the image source; The side of the substrate layer facing away from the image source is connected to the plane where the bottom edge of the sawtooth portion of the array arrangement is located, and the side of the substrate layer facing the image source is in contact with the image source; The thickness of the substrate layer is 50 μm to 1 mm; The length of the second side of a single sawtooth portion is greater than the length of the first side.

9. A display device, characterized in that: include: The anti-glare film and image source as described in any one of claims 1 to 8; The anti-glare film is arranged on the light-emitting side of the image source.

10. The display device according to claim 9, characterized in that: Also includes: An adhesive layer, through which the anti-glare film is attached to the image source; An absolute value of a difference between a refractive index of the adhesive layer and a refractive index of the image source is less than or equal to a preset difference threshold.

11. A head-up display device, characterized in that: include: The display device and the reflective imaging unit according to any one of claims 9 to 10; The reflective imaging part is used to reflect the image light emitted by the image source and after passing through the anti-glare film into the observation area.

12. The head-up display device according to claim 11, characterized in that: The second base angles of all the sawtooth portions in the anti-glare film are the same, or the second base angles of at least some of the sawtooth portions in the anti-glare film are different; Wherein, the second bottom angles of all the sawtooth portions in the anti-glare film satisfy: ∠C>(γ2+α2-180°)÷2-θ'; Among them, ∠C represents the second base angle, which is the angle between the second side and the base; γ2 represents the maximum angle between the virtual image formed by the reflective imaging part in the observation area and the projection of the anti-glare film on the preset plane; α2 represents the maximum angle between ambient light and the preset plane; θ' represents the angle between the plane where the light-emitting side of the image source is located and the preset plane.

13. A vehicle, characterized in that: include: The head-up display device according to claim 11 or 12; The plane where the second side edge is located faces the incident direction of the ambient light.

Images